.center {
    width: 100%;
    height: 1000px;
    background-image: url(../images/xmy/bg1.jpg);
    background-size: 100% 100%;
    background-repeat: no-repeat;
    margin: 0;
    padding: 100px;
    box-sizing: border-box;
}

.box {
    /* position: absolute;
    top: 150px;
    left: 200px; */
    /* padding-top: 100px; */
    margin: 0 100px;
    background-color: whitesmoke;
    width: 700px;
    height: 550px;
}

.box2-1 {
    width: 700px;
    height: 200px;
}